package com.front.teacher.teacherapp.weight;


import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.front.teacher.teacherapp.R;


/**
 * 
 * @author loongggdroid
 * 
 */
public class RoundImageView extends ImageView {
    private int mBorderThickness = 0;
    private Context mContext;
    private int defaultColor = 0xFFFFFFFF;
    // ��Բ�߿���ɫ
    private int mBorderOutsideColor = 0;
    // ��Բ�߿���ɫ
    private int mBorderInsideColor = 0;
    // RoundImageView�ؼ�Ĭ�ϵĳ�����
    private int defaultWidth = 0;
    private int defaultHeight = 0;
 
    public RoundImageView(Context context) {
        super(context);
        mContext = context;
    }
 
    public RoundImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        // ����RoundImageView������ֵ��������ɫ����ȵ�
        setRoundImageViewAttributes(attrs);
    }
 
    public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        mContext = context;
        setRoundImageViewAttributes(attrs);
    }
 

    private void setRoundImageViewAttributes(AttributeSet attrs) {
        TypedArray a = mContext.obtainStyledAttributes(attrs,
                R.styleable.round_image_view);
        mBorderThickness = a.getDimensionPixelSize(
                R.styleable.round_image_view_border_width, 0);
        mBorderOutsideColor = a.getColor(
                R.styleable.round_image_view_border_outcolor, defaultColor);
        mBorderInsideColor = a.getColor(
                R.styleable.round_image_view_border_incolor, defaultColor);
        a.recycle();
    }
 
    // ������ͣ��������Զ���һ���ؼ�����ôʵ���أ���RoundImageViewΪ���������Ǽ̳�ImageView,Ȼ��ʵ���乹�캯�����ڹ��캯���У���ȡattr�е�����ֵ���ٴν��ͣ������ȡ�ľ����������Ե�ֵ����ô�����أ�������ɫ�Ϳ�ȣ������attr.xml�ж�������ص����֣�����ʹ��RoundImageView��xml�����ļ��У����ǻ�������ֵ��������Ҫ�õ�ֵ�����Ǵ��������õģ����������ڱ��ؼ��У�Ȼ��̳�onDraw�����������Լ���Ҫ��ͼ�λ�����״����
    /**
     * ����Ǽ̳еĸ����onDraw����
     * 
     * onDraw������ķ������ùܣ�������ѧϰ�Զ���û��ϵ������ʵ����ô��Բ�ģ�����Ըı�����������Ż�������ͷ�񣬹���
     */
    @Override
    protected void onDraw(Canvas canvas) {
        Drawable drawable = getDrawable();
        if (drawable == null) {
            return;
        }
        if (getWidth() == 0 || getHeight() == 0) {
            return;
        }
        this.measure(0, 0);
        if (drawable.getClass() == NinePatchDrawable.class)
            return;
        Bitmap b = ((BitmapDrawable) drawable).getBitmap();
        Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
        if (defaultWidth == 0) {
            defaultWidth = getWidth();
        }
        if (defaultHeight == 0) {
            defaultHeight = getHeight();
        }
        int radius = 0;
        // ������ж��������Բ����Բ���õ���ɫֵ��Ϊ���Ҳ���Ĭ����ɫ���Ͷ��廭����Բ�򣬷ֱ�Ϊ��Բ����Բ�߿�
        if (mBorderInsideColor != defaultColor
                && mBorderOutsideColor != defaultColor) {
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - 2 * mBorderThickness;
            // ����Բ
            drawCircleBorder(canvas, radius + mBorderThickness / 2,
                    mBorderInsideColor);
            // ����Բ
            drawCircleBorder(canvas, radius + mBorderThickness
                    + mBorderThickness / 2, mBorderOutsideColor);
        } else if (mBorderInsideColor != defaultColor
                && mBorderOutsideColor == defaultColor) {// ������������Բ�߿�Ϊ������ɫֵ����Ĭ��ֵ���ͻ�һ����Բ�ı߿�
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2,
                    mBorderInsideColor);
        } else if (mBorderInsideColor == defaultColor
                && mBorderOutsideColor != defaultColor) {// ������������Բ�߿�Ϊ������ɫֵ����Ĭ��ֵ���ͻ�һ����Բ�ı߿�
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2 - mBorderThickness;
            drawCircleBorder(canvas, radius + mBorderThickness / 2,
                    mBorderOutsideColor);
        } else {// ���������û������������ɫ������£���û�б߿�����
            radius = (defaultWidth < defaultHeight ? defaultWidth
                    : defaultHeight) / 2;
        }
        Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
        canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
                / 2 - radius, null);
    }
 
    /**
     * ��ȡ�ü����Բ��ͼƬ
     * 
     * @param bmp
     * @param radius
     *            �뾶
     * @return
     */
    public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
        Bitmap scaledSrcBmp;
        int diameter = radius * 2;
        // Ϊ�˷�ֹ��߲���ȣ����Բ��ͼƬ���Σ���˽�ȡ�������д����м�λ������������ͼƬ
        int bmpWidth = bmp.getWidth();
        int bmpHeight = bmp.getHeight();
        int squareWidth = 0, squareHeight = 0;
        int x = 0, y = 0;
        Bitmap squareBitmap;
        if (bmpHeight > bmpWidth) {// �ߴ��ڿ�
            squareWidth = squareHeight = bmpWidth;
            x = 0;
            y = (bmpHeight - bmpWidth) / 2;
            // ��ȡ������ͼƬ
            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
                    squareHeight);
        } else if (bmpHeight < bmpWidth) {// ����ڸ�
            squareWidth = squareHeight = bmpHeight;
            x = (bmpWidth - bmpHeight) / 2;
            y = 0;
            squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
                    squareHeight);
        } else {
            squareBitmap = bmp;
        }
        if (squareBitmap.getWidth() != diameter
                || squareBitmap.getHeight() != diameter) {
            scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
                    diameter, true);
        } else {
            scaledSrcBmp = squareBitmap;
        }
        Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
                scaledSrcBmp.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
 
        Paint paint = new Paint();
        Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
                scaledSrcBmp.getHeight());
 
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        canvas.drawARGB(0, 0, 0, 0);
        canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
                scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
                paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
        bmp = null;
        squareBitmap = null;
        scaledSrcBmp = null;
        return output;
    }
 
    /**
     * ����Ե��Բ������Բ������Բ
     */
    private void drawCircleBorder(Canvas canvas, int radius, int color) {
        Paint paint = new Paint();
        /* ȥ��� */
        paint.setAntiAlias(true);
        paint.setFilterBitmap(true);
        paint.setDither(true);
        paint.setColor(color);
        /* ����paint�ġ�style��ΪSTROKE������ */
        paint.setStyle(Paint.Style.STROKE);
        /* ����paint������� */
        paint.setStrokeWidth(mBorderThickness);
        canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
    }
}